639504946 has 32 divisors (see below), whose sum is σ = 1027458432. Its totient is φ = 297480960.

The previous prime is 639504937. The next prime is 639504947. The reversal of 639504946 is 649405936.

It is a junction number, because it is equal to n+sod(n) for n = 639504896 and 639504905.

It is not an unprimeable number, because it can be changed into a prime (639504947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2056131 + ... + 2056441.

It is an arithmetic number, because the mean of its divisors is an integer number (32108076).

Almost surely, 2^639504946 is an apocalyptic number.

639504946 is a deficient number, since it is larger than the sum of its proper divisors (387953486).

639504946 is a wasteful number, since it uses less digits than its factorization.

639504946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834.

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 639504946 is about 25288.4350247302. The cubic root of 639504946 is about 861.5516183811.

The spelling of 639504946 in words is "six hundred thirty-nine million, five hundred four thousand, nine hundred forty-six".